feat: Python telemetry client SDK v0.1.0

Standalone Python package (mosaicstack-telemetry) for reporting
task-completion telemetry and querying predictions from the Mosaic
Stack Telemetry server.

- Sync/async TelemetryClient with context manager support
- Thread-safe EventQueue with bounded deque
- BatchSubmitter with httpx, exponential backoff, Retry-After
- PredictionCache with TTL
- EventBuilder convenience class
- All types standalone (no server dependency)
- 55 tests, 90% coverage, mypy strict clean

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_client.py

@@ -10,9 +10,7 @@ from mosaicstack_telemetry.client import TelemetryClient
 from mosaicstack_telemetry.config import TelemetryConfig
 from mosaicstack_telemetry.types.events import (
     Complexity,
-    Outcome,
     Provider,
-    TaskCompletionEvent,
     TaskType,
 )
 from mosaicstack_telemetry.types.predictions import (
@@ -24,7 +22,6 @@ from tests.conftest import (
     TEST_API_KEY,
     TEST_INSTANCE_ID,
     TEST_SERVER_URL,
-    make_batch_response_json,
     make_event,
 )
 
@@ -146,9 +143,7 @@ class TestTelemetryClientPredictions:
         )
         assert client.get_prediction(query) is None
 
-    def test_get_prediction_after_cache_populated(
-        self, config: TelemetryConfig
-    ) -> None:
+    def test_get_prediction_after_cache_populated(self, config: TelemetryConfig) -> None:
         """get_prediction returns cached value."""
         client = TelemetryClient(config)
         query = PredictionQuery(
@@ -241,9 +236,7 @@ class TestTelemetryClientPredictions:
         assert result.metadata.sample_size == 60
 
     @respx.mock
-    async def test_refresh_predictions_server_error(
-        self, config: TelemetryConfig
-    ) -> None:
+    async def test_refresh_predictions_server_error(self, config: TelemetryConfig) -> None:
         """refresh_predictions handles server errors gracefully."""
         query = PredictionQuery(
             task_type=TaskType.IMPLEMENTATION,
@@ -262,9 +255,7 @@ class TestTelemetryClientPredictions:
         # Cache should still be empty
         assert client.get_prediction(query) is None
 
-    async def test_refresh_predictions_empty_list(
-        self, config: TelemetryConfig
-    ) -> None:
+    async def test_refresh_predictions_empty_list(self, config: TelemetryConfig) -> None:
         """refresh_predictions with empty list is a no-op."""
         client = TelemetryClient(config)
         await client.refresh_predictions([])